Loop Piece for Diapers Preventing Adhesive Penetration
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Solution Overview
Problem
Existing mechanical closing structures in baby and adult diapers face issues with reduced adherence strength due to liquid thermoplastic penetration into loops, leading to weakened loop integrity and mechanical strength.
Innovation Solution
A loop piece featuring a loopless nonwoven fabric with separately formed loops on a base, combined with a printed or printless thermoplastic layer using lamination or extrusion methods, preventing adhesive penetration and enhancing breaking and tearing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid thermoplastic material or adhesive is applied to combine the plastic layer with the loop fabric, then the layers are bonded together, but the liquid material penetrates into the loops causing reduced adherence strength and weakened loop integrity
Solution Approach 1:
A release paper is introduced as an intermediary layer between the adhesive/thermoplastic material and the loops during the bonding process. This release paper prevents the liquid adhesive from penetrating into the loops while still allowing the adhesive to bond the plastic layer to the loopless fabric base. After bonding, the release paper is removed, leaving the loops free and intact with full adherence strength.
Solution Approach 2:
The release paper is placed on the loop fabric base before applying the adhesive or thermoplastic material. This preliminary placement creates a protective barrier that prevents adhesive penetration before the harmful effect can occur, allowing the bonding process to proceed without compromising loop integrity.
2Object-generated harmful factors
If less adhesive is used to reduce penetration, then adhesive penetration into loops is reduced, but the adherence strength between layers decreases and layers can be easily separated
Solution Approach 1:
The release paper acts as a mediator that decouples the relationship between adhesive quantity and loop protection. It allows sufficient adhesive to be applied for strong layer bonding while simultaneously preventing any adhesive from reaching the loops, regardless of the adhesive amount used. This resolves the trade-off by providing a physical barrier that makes adhesive quantity independent of loop integrity.
3Shape
If loops are formed on a thermoplastic film base, then loop structure is created, but mechanical strength is reduced during the loop making process
Solution Approach 1:
The loop structure is segmented from the base fabric by forming loops on a loopless nonwoven fabric base rather than on a continuous thermoplastic film. This segmentation allows the loops to be formed as separate entities that can be individually strengthened while maintaining the overall structural integrity of the base fabric, avoiding the mechanical weakness inherent in continuous film-based loop structures.
Solution Approach 2:
The invention uses a composite structure combining a loopless nonwoven fabric base with separately formed loops. This composite approach allows optimization of each component: the nonwoven base provides mechanical strength and stability, while the separately formed loops provide the necessary fastening function with enhanced strength compared to loops formed on thermoplastic film.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a stronger loop piece with improved adherence and durability, ensuring effective closure and tightness of diapers.
Implementation Method 1
combined with a printed or printless thermoplastic layer using lamination or extrusion methods
Implementation Method 2
combined with a printed or printless thermoplastic layer using lamination or extrusion methods
Data Source
Figure 1
Figure 2~3
AI summary
The invention is related to a loop piece (20) used on straps having at least one hooked piece (10) to connect the front and back sides of especially baby diapers and adult diapers and formed as the counterpart for said hooked piece (10) to fasten and also to that it is comprised of at least one loopless nonwoven surface or fabric (24) and at least one loop (26) separately formed on it.